Decorative outdoor marker lamp



FIG. 1 is a front elevational view of a decorative outdoor marker lamp showing my new design, the rear being a mirror image;

FIG. 2 is a side elevational view thereof, the opposite side being a mirror image;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a decorative outdoor marker lamp, as shown and described. 